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Patrick Georgi 31bf37eb32 crossgcc: Improve compatibility of the toolchain across host systems
crossgcc builds gmp, whose build system normally optimises for the hardware
it's built on. That may give a minor performance boost but has the downside
that the compiler becomes non-portable and may break on other systems due to
illegal instructions.

Setting CFLAGS to some reasonable value prevents gmp's configure script from
choosing CPU specific -mtune flags (which may enable optimizations that only
run on CPUs with the same feature set).
Enabling "fat" builds make the build system add all optimized assembler
routines and makes the selection of the right one a runtime decision instead
of deciding at compile time.

Change-Id: I72d20627270baa082cd02ebb4c9a09cd23f30f8c
Signed-off-by: Patrick Georgi <patrick@georgi-clan.de>
Reviewed-on: http://review.coreboot.org/10412
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
2015-06-04 17:15:02 +02:00
3rdparty 3rdparty/blobs: Move submodule marker forward 2015-05-13 22:55:50 +02:00
Documentation Remove address from GPLv2 headers 2015-05-21 20:50:25 +02:00
payloads libpayload: usb: Support MTK xHCI host controller 2015-06-03 11:11:59 +02:00
src devicetree: Change scan_bus() prototype in device ops 2015-06-04 11:22:53 +02:00
util crossgcc: Improve compatibility of the toolchain across host systems 2015-06-04 17:15:02 +02:00
.gitignore gitignore: Have multiple crossgcc versions 2015-05-25 21:26:02 +02:00
.gitmodules 3rdparty/vboot: Add vboot 2015-05-05 22:49:34 +02:00
.gitreview add .gitreview 2012-11-01 23:13:39 +01:00
COPYING update license template. 2006-08-12 22:03:36 +00:00
MAINTAINERS MAINTAINERS: grab build system responsibility 2015-05-22 22:47:03 +02:00
Makefile make: support absolute and relative obj= specifications 2015-05-08 19:47:11 +02:00
Makefile.inc Make DSDT a file in CBFS rather than embedding it into ramstage. 2015-06-02 21:01:55 +02:00
README Update README with newer version of the text from the web page 2011-06-15 10:16:33 +02:00
toolchain.inc build system: only query the compiler runtime's location once 2015-05-26 08:25:50 +02:00

README

-------------------------------------------------------------------------------
coreboot README
-------------------------------------------------------------------------------

coreboot is a Free Software project aimed at replacing the proprietary BIOS
(firmware) found in most computers.  coreboot performs a little bit of
hardware initialization and then executes additional boot logic, called a
payload.

With the separation of hardware initialization and later boot logic,
coreboot can scale from specialized applications that run directly
firmware, run operating systems in flash, load custom
bootloaders, or implement firmware standards, like PC BIOS services or
UEFI. This allows for systems to only include the features necessary
in the target application, reducing the amount of code and flash space
required.

coreboot was formerly known as LinuxBIOS.


Payloads
--------

After the basic initialization of the hardware has been performed, any
desired "payload" can be started by coreboot.

See http://www.coreboot.org/Payloads for a list of supported payloads.


Supported Hardware
------------------

coreboot supports a wide range of chipsets, devices, and mainboards.

For details please consult:

 * http://www.coreboot.org/Supported_Motherboards
 * http://www.coreboot.org/Supported_Chipsets_and_Devices


Build Requirements
------------------

 * gcc / g++
 * make

Optional:

 * doxygen (for generating/viewing documentation)
 * iasl (for targets with ACPI support)
 * gdb (for better debugging facilities on some targets)
 * ncurses (for 'make menuconfig')
 * flex and bison (for regenerating parsers)


Building coreboot
-----------------

Please consult http://www.coreboot.org/Build_HOWTO for details.


Testing coreboot Without Modifying Your Hardware
------------------------------------------------

If you want to test coreboot without any risks before you really decide
to use it on your hardware, you can use the QEMU system emulator to run
coreboot virtually in QEMU.

Please see http://www.coreboot.org/QEMU for details.


Website and Mailing List
------------------------

Further details on the project, a FAQ, many HOWTOs, news, development
guidelines and more can be found on the coreboot website:

  http://www.coreboot.org

You can contact us directly on the coreboot mailing list:

  http://www.coreboot.org/Mailinglist


Copyright and License
---------------------

The copyright on coreboot is owned by quite a large number of individual
developers and companies. Please check the individual source files for details.

coreboot is licensed under the terms of the GNU General Public License (GPL).
Some files are licensed under the "GPL (version 2, or any later version)",
and some files are licensed under the "GPL, version 2". For some parts, which
were derived from other projects, other (GPL-compatible) licenses may apply.
Please check the individual source files for details.

This makes the resulting coreboot images licensed under the GPL, version 2.